Pumping apparatus



I Janl, 1940. H, E -GRAU 2,186,968

PUMPING APPARATUS Filed July 18, 1938 2 Sheets-Sheet 1 Janie, 1940. n H, E GRAU 2,186,968

PUMPING APPARATUS Filed July 18, 195sv 2 sheetsfsneer 2.

/ll9 I /119' 5 f 7 Patented Jan. 16, 1946 I f y UNITED., STATES'4 PATENT OFFICE# l :,laccs- Y l nel-bert n. Grou, venirrcaumr to Byron Jackson Co., Huntington Park, Calif., a corporation of Delaware Application July 18, 1938, Serial No. 219,805

1 Claim.v (Cl. ID3- 52) This invention relates to hydraulic pumps, and freely iioating in the. cylinder andfmovable solely is directed particularly to improvements in a in'response to the pressure differential across the multi-cylinder piston pump wherein' motive liqpiston. 'I'he vpiston divides the cylinder into a vuid is applied directly to the pumping pistons. motive liquid compartment it and a pump liquid 5 In` an application 'of-. Aladar Hollander and compartment I1.

Waldemar F. Mayer, Ser. No. 219,804, led con- Motive liquid under relatively high pressure is currently herewith, -theref-is disclosed a triplex admitted intermittently to each of the'comparthydraulic pump of the type wherein motive liqments I6 in predetermined sequence, to move the uid under relatively high pressure is admitted to pistons to the right and force 'pump liquid from 10 Acylinders' on one side of exible diaphragms therethe compartments I1. Between intervals of adl0- in, to move the diaphragms in a direction to force mission of motiv'e liquid to compartments I6,

f pump liquid from the cylinder spaces on the oppump liquid is forced into compartments I1 to posite sides of the diaphragms. Pump liquid unmove the pistons to the left and force spent motive der `relatively low pressure is forced into the cylliquid from compartments I6. 'I'his is accominders on the opposite sidesof the diaphragms beplished by supplying pump liquid to the suction 1l t tween intervals of admission of motive liquid, to header under low pressure, the reduction of motive force out spent motive liquid from the cylinders liquid pressure in compartments l5 allowing the and to charge the latter with pump liquid pre' inlet valves 5, 6, 1 to open and admit pump liquid paratory tothe succeeding pumping strokes. to the cylinders.

Aninherent characteristic ofadiaphragm pump The admission and exhaust of motive liquidfis-zo 'is the practical limitation on the length of stroke. controlled by valve mechanism generally desig or the displacement during each stroke. Inmany nated 2|. This valve mechanism is similar to cases. short, frequent strokes are desirable, while that illustrated and described 1n detail in the in Other instances a lng Stroke with reletively aforementioned application, and consequently a infrequent reversals is preferable. The latter is brief description thereof will siiiice. A valve body 5/ true particularly in the pumping of drilling mild 22 extending transversely across the motive liquid during drilling deep oil wells. end of the pump hasformed therein a plurality It is a. principal object. of this invention to pro-` of vertically extending bores 23, 24, and 25. As vide a pump 0f the same general type as that deshown in Fig. 2, the bore 24 vcommunicates by scribed in the efOrementiOned applleeon. emaport 2i with. the motive'liquid chamber I6 of 80- bodyin most of the advantageous features therecylinder 2, and in a similar manner bores 23 and .0L and eliminating the limitation on the length 25 communicate with the motive liquid chambersi of the stroke. of cylinders I and 3 respectively.

Other more specic obiects will be apparent A motive uquid inlet 3| F1g.2 communicates 8 from the following description, taken in conjuncwith each of the valve bores, whereby motive liquid 85 tion with the accompanying @Win88, wherein: is admitted to the cylinders in predetermined se- Fig. 1' is a top planl view of the pump; quence-under the control of shuttle valves .33, 34 F18- 2 iS a Central lengltllflinl Seclinn teken 0n and 35 reciprocable in the bores 23,- 2l, and 25, line 2-2 of Fig. 1; respectively. The valves are-interconnected to 4o' Fig. 3 is a transverse section taken on line 3-3 reciprocate in equally spaced phase relationship, 4o of Fig. 2; y by connecting rods secured to the vlaves and to a Fis. 4 is a transverse section'taken 0n line 4-4 crank shaft as. In their .uppermost positions the valves cut off communication between the inlet ofiiignnond Fig. 5 is a fragmentary vertical section taken Il and their respective cylinders and establish on line 5 5 of Fig. 4. communication Between the latter and a discharge 4,5

Referring tothe drawings, the pump comprises chamber 31 from which a dischargeoutlet 38 leads `Senerttlll e plurality 0f Vcylinders l. 2. and l back to the source of motive liquid. Likewise, in

` mnnted 011 a 4 and provided respettively their lowermost positions the valves admit motivewithpump liquid inlet and discharge valves 5, 5'. liquid` fromjinlet 3l to their respective cylinders,

' I, 8', and 1, 1'. The inlet valves control commuthe discharge chamber 31 beingclosed to the cyl- 50 nication between the cylinders an'd a common inders during the admission of motive liquid. suction header 8, and the discharge valves control The valves are actuated by vmotive -uquiq actcommunication between the cylinders and a com- ,ing on shuttle-pistons M, and 45 connected remon :discharge header I. l spectively to the valves I3, 34, I5 and reciprocable I5 Reciprocable in each cylinder is a piston I5, in the bores 28, 2l, and 25.v Motive iiquidis adu mitted in sequence to the bores above the pistons through ports 46, 41, and I8 (Figs. 4 and 5) under the control of a rotary valve 50 mounted on one end of the crank shaft 3G.

The iiow of motive liquid to the valve motor is regulated in accordance with the flow to the main cylinders, and for this purpose a Venturi regulator 5l is interposed between the motive liquid supply line and the inlet 3l. A. throttle valve 52 in the regulator controls the ow of motive liquid to conduit 53 leading tothe valve 50, the extent of opening of the throttle valve being controlled by the ow of motive liquid through the throat of the Venturi nozzle.

From the foregoing description, the mode of operation of the pump will be apparent. As motive liquid is admitted successively to the chambers above the shuttle pistons 43, M, and 45, the valves 33, 34, and4 35 are reciprocated to alternately admit motive liquid to the main cylinders and exhaust spent motive liquid therefrominequally spaced phase relationship. 'I'ne floating pistons l5 are caused to move to the right, as viewed in Fig. 2, to discharge pump liquid from the chambers I1 under relatively high pressure, and on release of the motive liquid pressure the pistons are moved to the left by pump liquid supplied to the suction header 8 at relatively low pressure.

It will be evident that a simple, rugged pump has been provided, wherein the pump liquid is vpressure on opposite sides thereof, a common source of motive liquid at relatively high pressure, valve means for alternately admitting and exhausting said motive liquid in predetermined sequence to land from each of said cylinders on one side of their respective pistons, to move the n latter in one direction and permit their return, a common source of pump' liquid at relatively low pressure, valve means for admitting said pump liquid to said cylinders on the opposite sides of said pistons between intervals of admission of 25 motive liquid, to move said'pistons in the opposite direction, and valve means for discharging pump liquid from said cylinders in response to movement of said pistons in said one direction.

HERBERT E. GRAU. ,o 

